ashtech G12 - PDP: PDOP Mask Value; PEM: Position Elevation Mask Value; PHE: Photogrammetry Edge Mode

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Commands
autonomous positions (e.g. due to the lack of current RTCM correction) the AUT
mask parameters will be used until differential position fixes are computed, which
will be masked by the DIF parameters.
Example
Enter the following command to set the horizontal error mask to 2 meters and the
vertical error mask to 4 meters for all positioning modes:
$PASHS,ERM,ALL,2,4
Users who currently use the RMS and standard deviation information reported in the GST message,
and who also use the PDOP mask to screen out position fixes in less than favorable conditions, may
choose to disable the additional ERM masking feature. To disable the ERM, use the default ERM
settings or issue the command: $PASHS,ERM,ALL,6000,6000.
FIX: Fixed Altitude Mode
$PASHS,FIX,d1
This command allows you to set the fixed altitude mode. It is typically used when
the receiver is in 2-D position mode or when there are not enough visible satellites
to compute a 3-D position; d1 can be 0 or 1. You can view the current setting for
fixed altitude mode with the $PASHQ,PAR command and checking the FIX field.
• Fixed Altitude Mode 0
The most recently recorded antenna altitude is used. The altitude value is
taken either from the altitude entered through the $PASHS,ALT command
or from the last altitude computed in which the VDOP value is lower than
the value entered for the VDOP mask
• Fixed Altitude Mode 1
Only the most recent altitude value entered through the $PASHS,ALT
command is used.
DEFAULT SETTING
ERM Positioning Mode Horizontal Mask Vertical Mask
Autonomous 6000 6000
Code Differential 6000 6000
G12RevD.book Page 67 Tuesday, April 2, 2002 4:33 PM